Lin Giung-Ling, Tsai Yi-Hua, Lin Hong-Ping, Tang Chih-Yuan, Lin Ching-Yen
Department of Chemistry, National Cheng Kung University, Tainan, Taiwan.
Langmuir. 2007 Apr 10;23(8):4115-9. doi: 10.1021/la070154t. Epub 2007 Mar 17.
Mesoporous silica helical fibers in many different shapes have been synthesized in a highly dilute silicate solution at pH approximately 2.0 by using CnTMAB-SDS-P123 (n = 14-18) ternary surfactant as a template. The mesoporous silica helical fibers possess a well-ordered hexagonal mesostructure, high surface area, and large pore volume. Thus, the microtome sections of the helical fibers demonstrate a concentric mesotructure or two hemiconcentric mesostructures. In addition to triblock copolymer, adding the proper amount of 1-butanol or pentanol can promote the yield of the helical fibers as well. The yield of the surfactant-templated helical fibers is also dependent on the water content, reaction temperature, and pH value of the solution. The mesoporous silica helical fiber can be used as a solid template to prepare mesoporous carbon helical fibers via impregnation of phenol-formaldehyde, pyrolysis, and silica removal.
通过使用CnTMAB-SDS-P123（n = 14 - 18）三元表面活性剂作为模板，在pH约为2.0的高度稀释硅酸盐溶液中合成了许多不同形状的介孔二氧化硅螺旋纤维。介孔二氧化硅螺旋纤维具有有序的六方介孔结构、高比表面积和大孔体积。因此，螺旋纤维的切片显示出同心介孔结构或两个半同心介孔结构。除了三嵌段共聚物外，添加适量的1-丁醇或戊醇也可以提高螺旋纤维的产率。表面活性剂模板螺旋纤维的产率还取决于溶液的含水量、反应温度和pH值。介孔二氧化硅螺旋纤维可以用作固体模板，通过浸渍酚醛、热解和去除二氧化硅来制备介孔碳螺旋纤维。
